Why are your brakes locking on your Peugeot 106?

They aren't, however if they are locking on your 106 then the 1st thing to do is to check your tyre's have plenty of tread, and that they are good quality tyres.

If the car has ABS there is a bigger problem.

If its the rear locking up before the front it may be due to the brake bias valve needing adjusting.

Of course your brakes will lock on ice or other slippery surfaces, so dont brake hard and gradually increase the braking force.

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Having too much pressure (air) in your tyres can also be a cause, as there will be less of the tyre in contact with the road.

If the brakes are locking when the car has been parked for a while, it is usually the rear brakes sticking. This can be resolved by rocking it backwards and forwards, either manually or by using first and reverse gears.

I have also known the friction linings to come off the the rear brake shoes and jam/lock the rear wheels. This requires the rear wheels and brake drums to be removed and new brake shoes fitted.